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Volume 16, issue 15
Atmos. Chem. Phys., 16, 10229-10239, 2016
https://doi.org/10.5194/acp-16-10229-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 10229-10239, 2016
https://doi.org/10.5194/acp-16-10229-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Aug 2016

Research article | 12 Aug 2016

A joint data record of tropospheric ozone from Aura-TES and MetOp-IASI

Hilke Oetjen1,2, Vivienne H. Payne1, Jessica L. Neu1, Susan S. Kulawik1,3, David P. Edwards4, Annmarie Eldering1,2, Helen M. Worden4, and John R. Worden1 Hilke Oetjen et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
  • 2The UCLA/JPL Joint Institute for Regional Earth System Science and Engineering, Los Angeles, California, USA
  • 3BAER Institute, Mountain View, California, USA
  • 4National Center for Atmospheric Research, Boulder, Colorado, USA

Abstract. The Tropospheric Emission Spectrometer (TES) on Aura and Infrared Atmospheric Sounding Interferometer (IASI) on MetOp-A together provide a time series of 10 years of free-tropospheric ozone with an overlap of 3 years. We characterise the differences between TES and IASI ozone measurements and find that IASI's coarser vertical sensitivity leads to a small (<5ppb) low bias relative to TES for the free troposphere. The TES-IASI differences are not dependent on season or any other factor and hence the measurements from the two instruments can be merged, after correcting for the offset, in order to study decadal-scale changes in tropospheric ozone. We calculate time series of regional monthly mean ozone in the free troposphere over eastern Asia, the western United States (US), and Europe, carefully accounting for differences in spatial sampling between the instruments. We show that free-tropospheric ozone over Europe and the western US has remained relatively constant over the past decade but that, contrary to expectations, ozone over Asia in recent years does not continue the rapid rate of increase observed from 2004 to 2010.

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We developed and tested a strategy for combining TES and IASI free-tropospheric ozone data. A time series of the merged ozone data is presented for regional monthly means over the western US, Europe, and eastern Asia. We show that free-tropospheric ozone over Europe and the western US has remained relatively constant over the past decade but that, contrary to expectations, ozone over Asia in recent years does not continue the rapid rate of increase observed from 2004–2010.
We developed and tested a strategy for combining TES and IASI free-tropospheric ozone data. A...
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